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<tr class="t-dsc">
<td> <code><b>&lt;assert.h&gt;</b></code>
</td>
<td> <a href="error.html" title="c/error">Conditionally compiled macro that compares its argument to zero</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;complex.h&gt;</b></code> <span class="t-mark-rev t-since-c99">(since C99)</span>
</td>
<td> <a href="numeric/complex.html" title="c/numeric/complex">Complex number arithmetic</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;ctype.h&gt;</b></code>
</td>
<td> <a href="string/byte.html" title="c/string/byte">Functions to determine the type contained in character data</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;errno.h&gt;</b></code>
</td>
<td> <a href="error.html" title="c/error">Macros reporting error conditions</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;fenv.h&gt;</b></code> <span class="t-mark-rev t-since-c99">(since C99)</span>
</td>
<td> <a href="numeric/fenv.html" title="c/numeric/fenv">Floating-point environment</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;float.h&gt;</b></code>
</td>
<td> <a href="types/limits.html#Limits_of_floating_point_types" title="c/types/limits">Limits of float types</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;inttypes.h&gt;</b></code> <span class="t-mark-rev t-since-c99">(since C99)</span>
</td>
<td> <a href="types/integer.html" title="c/types/integer">Format conversion of integer types</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;iso646.h&gt;</b></code> <span class="t-mark-rev t-since-c95">(since C95)</span>
</td>
<td> <a href="language/operator_alternative.html" title="c/language/operator alternative"> Alternative operator spellings</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;limits.h&gt;</b></code>
</td>
<td> <a href="types/limits.html" title="c/types/limits">Sizes of basic types</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;locale.h&gt;</b></code>
</td>
<td> <a href="locale.html" title="c/locale">Localization utilities</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;math.h&gt;</b></code>
</td>
<td> <a href="numeric/math.html" title="c/numeric/math">Common mathematics functions</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;setjmp.h&gt;</b></code>
</td>
<td> <a href="program.html" title="c/program">Nonlocal jumps</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;signal.h&gt;</b></code>
</td>
<td> <a href="program.html" title="c/program">Signal handling</a>
</td>
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<tr class="t-dsc">
<td> <code><b>&lt;stdalign.h&gt;</b></code> <span class="t-mark-rev t-since-c11">(since C11)</span>
</td>
<td> <a href="types.html" title="c/types">alignas and alignof</a> convenience macros
</td>
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<tr class="t-dsc">
<td> <code><b>&lt;stdarg.h&gt;</b></code>
</td>
<td> <a href="variadic.html" title="c/variadic">Variable arguments</a>
</td>
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<tr class="t-dsc">
<td> <code><b>&lt;stdatomic.h&gt;</b></code> <span class="t-mark-rev t-since-c11">(since C11)</span>
</td>
<td> <a href="atomic.html" title="c/atomic">Atomic types</a>
</td>
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<tr class="t-dsc">
<td> <code><b>&lt;stdbool.h&gt;</b></code> <span class="t-mark-rev t-since-c99">(since C99)</span>
</td>
<td> <a href="types/boolean.html" title="c/types/boolean">Boolean type</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;stddef.h&gt;</b></code>
</td>
<td> <a href="types.html" title="c/types">Common macro definitions</a>
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<tr class="t-dsc">
<td> <code><b>&lt;stdint.h&gt;</b></code> <span class="t-mark-rev t-since-c99">(since C99)</span>
</td>
<td> <a href="types/integer.html" title="c/types/integer">Fixed-width integer types</a>
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<td> <code><b>&lt;stdio.h&gt;</b></code>
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<td> <a href="io.html" title="c/io">Input/output</a>
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<td> <code><b>&lt;stdlib.h&gt;</b></code>
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<td> General utilities: <a href="memory.html" title="c/memory">memory management</a>, <a href="program.html" title="c/program">program utilities</a>, <a href="string.html" title="c/string">string conversions</a>, <a href="numeric/random.html" title="c/numeric/random">random numbers</a>
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<td> <code><b>&lt;stdnoreturn.h&gt;</b></code> <span class="t-mark-rev t-since-c11">(since C11)</span>
</td>
<td> <a href="types.html" title="c/types">noreturn</a> convenience macros
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<td> <code><b>&lt;string.h&gt;</b></code>
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<td> <a href="string/byte.html" title="c/string/byte">String handling</a>
</td>
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<tr class="t-dsc">
<td> <code><b>&lt;tgmath.h&gt;</b></code> <span class="t-mark-rev t-since-c99">(since C99)</span>
</td>
<td> <a href="numeric/tgmath.html" title="c/numeric/tgmath">Type-generic math</a> (macros wrapping math.h and complex.h)
</td>
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<tr class="t-dsc">
<td> <code><b>&lt;threads.h&gt;</b></code> <span class="t-mark-rev t-since-c11">(since C11)</span>
</td>
<td> <a href="thread.html" title="c/thread">Thread library</a>
</td>
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<tr class="t-dsc">
<td> <code><b>&lt;time.h&gt;</b></code>
</td>
<td> <a href="chrono.html" title="c/chrono">Time/date utilities</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;uchar.h&gt;</b></code> <span class="t-mark-rev t-since-c11">(since C11)</span>
</td>
<td> <a href="string/multibyte.html" title="c/string/multibyte">UTF-16 and UTF-32 character utilities</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;wchar.h&gt;</b></code> <span class="t-mark-rev t-since-c95">(since C95)</span>
</td>
<td> <a href="string/wide.html" title="c/string/wide">Extended multibyte and wide character utilities</a>
</td>
</tr>


<tr class="t-dsc">
<td> <code><b>&lt;wctype.h&gt;</b></code> <span class="t-mark-rev t-since-c95">(since C95)</span>
</td>
<td> <a href="string/wide.html" title="c/string/wide">Wide character classification and mapping utilities</a>
</td>
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<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: References">edit</a>]</span> <span class="mw-headline" id="References">References</span>
</h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd>
<ul><li> 7 Library (p: 180-457)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999): 
</li></ul>
<dl><dd>
<ul><li> 7 Library (p: 164-402)
</li></ul>
</dd></dl>
<div class="t-ref-std-c89">
<ul><li> C89/C90 standard (ISO/IEC 9899:1990): 
</li></ul>
<dl><dd>
<ul><li> 4 LIBRARY 
</li></ul>
</dd></dl>
</div>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td colspan="2"> <div class="t-dsc-see">
<span><a href="../cpp/header.html" title="cpp/header">C++ documentation</a></span> for <span class="t-dsc-see-tt"><span>C++ Standard Library header files</span></span>
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